How can pressure gauges be maintained and repaired on a daily basis？

The calibration, maintenance and daily upkeep of pressure gauges are crucial steps for ensuring their measurement accuracy and service life. Here is a detailed guide:

          
1.Pressure Gauge Inspection            
a.Inspection Cycle:            
· Mandatory calibration: Pressure gauges used in safety protection, trade settlement and other fields (such as boilers and pressure vessels) must be calibrated in accordance with national regulations (generally once every 6 months) and affixed with a qualified label.            
· General industrial meters: It is recommended to conduct an inspection once a year, or shorten the inspection cycle based on the frequency of use and environmental conditions.            
·Exceptional situation: If there is pointer jamming, abnormal indication, or any impact has occurred, it is necessary to conduct an immediate inspection.            
            
b.Test Method:            
· Selection of standard equipment: Use a standard pressure source with a precision higher than that of the test gauge by a factor of 3 (such as a piston pressure gauge or a digital pressure testing instrument).            
· Inspection points: Typically, key points such as 25%, 50%, 75% and 100% of the measurement range are selected to compare the standard value with the actual measured value.            
·Error determination: The allowable error is calculated based on the accuracy grade (e.g., grade 1.6), and if it exceeds the limit, it needs to be adjusted or scrapped.            
·Record: Store the verification data, including the date, standard instrument number, error value, and operator information.            
            
2.Pressure Gauge Maintian            
a.Common Faults and Solutions:            
· Pointer not moving or not returning to zero: Check if the pressure guiding tube is blocked. If so, clear it or replace it. Check if the spring tube/membrane is leaking. Replace the damaged components if necessary.            
·Indicated error is large: Adjust the gear clearance of the movement or the position of the connecting rod. If the elastic elements deform due to long-term overloading, it is recommended to scrap the product.            
· Pointer jitter: Install a buffer valve or shock absorber (for pulsating pressure applications).            
· Dial leakage: Replace the sealing gasket or tighten the connection. For oil-free meters, ensure there is no oil or contamination.            
            
b.Maintenance Precautions:            
·Non-professionals are strictly prohibited from disassembling the head to prevent damage to the precision components.            
·After the repair, it must be rechecked and can only be put into use if it is found to be qualified.            
            
3.Daily maintenance points            
a.Installation and Usage:            
·During installation, avoid strong vibrations, high temperatures or corrosive environments. If necessary, install shock-absorbing pads or isolation membranes.            
·When the medium is corrosive gas or liquid, choose stainless steel material or a fluorine-filled pressure gauge.            
·During winter, for the purpose of preventing freezing, condensation elbow pipes should be installed for the steam medium.            
            
b.Periodical Inspection：            
·Visual inspection: Check if the dial glass is cracked, if the pointers are deformed, and if there is any leakage in the sealing performance.            
·Zero-point check: In the off state, the pointer should return to zero (or indicate the atmospheric pressure value).            
·Connection check: Check if the pressure guiding tube and valve connections are loose or rusted.            
            
c.Cleaning and Maintenance:            
· Regularly clean the dust from the case. In humid environments, moisture-proof treatment is necessary.            
· Oil-free gauges (such as oxygen gauges) must not come into contact with grease. During calibration, special equipment is required.            
            
4.Safety Tips            
·Inspection period: The pressure gauge should be operated within 75% of its full scale for long-term use to avoid overload.            
·Warranty standard: When the elastic components undergo permanent deformation, the movement is severely worn, or the calibration fails multiple times, replacement is required.            
·Special equipment: Pressure gauges for safety monitoring in special equipment (such as boilers, pressure pipelines) must be verified by an accredited institution.